Added "new part" feature

- Create a new part
- Button provided on the "category" list page

InvenTree/part/templates/part/create.html

@@ -0,0 +1,18 @@
+{% extends "base.html" %}
+
+{% load static %}
+
+{% block content %}
+
+{% include "part/cat_link.html" with category=category %}
+
+<div class='panel panel-primary'>
+    <div class='panel-heading'>Create a new part{% if category %} in category '{{ category.name }}'{% endif %}</div>
+    <div class='panel-body'>
+
+{% load crispy_forms_tags %}
+{% crispy form %}
+
+</div>
+
+{% endblock %}

InvenTree/part/templates/part/index.html

@@ -28,5 +28,8 @@ Parts:
 </ul>
 {% endif %}
 
+<a href="/part/create/{% if category %}?category={{ category.id }}{% endif %}">
+    <button class="btn btn-default">New Part</button>
+</a>
 {% endblock %}